Some of the less expensive UPS devices have two sets of plugs. One set provides backup power and the other set only provides surge protection. You need to ensure that the devices for which you want backup power are plugged into the correct outlets on the UPS.

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1. Four beeps every 30seconds (On Battery LED will be illuminated)This alarm indicates that the Battery PowerSupplied outlets are now supplying battery power as opposed to power from theutility. If the UPS determines that the input utility power is unsafe for yourcomputer equipment, the UPS will switch to battery power. Note: Ifthe power disturbance is brief, you may only hear one or two beeps.

2. Continuous Beeping (On Battery LED will beilluminated)This alarm indicates that a Low Batterycondition has been reached and that the UPS will soon shutdown. Once the UPStransfers to On Battery operation, it can only stay on battery for a limitedamount of time. The UPS will sound this alarm about two minutes before thebatteries are totally exhausted. Once exhausted, the UPS will shutdown and turnoff its output power to your equipment. If you hear this tone you shouldimmediately shutdown your computer to prevent data loss or corruption.

3. Continuous Beeps for 30 seconds (BackUPS OFFICE 250 and 280 ONLY)This alarm indicates the unit has detected anOverload condition after it has performed a self-test during start-up.

4. Continuous Two-Tone BeepThis alarm indicates a severe Overload wasdetected while the unit was on-battery operation. This tone will continue tosound until the unit shuts down.

5. Continuous Tone (On Battery LED will beflashing)This alarm indicates that the battery-poweredoutlets are overloaded.

The power overload warning should only come on if you have too much of a load plugged into the UPS. You may be close enough to the edge of the limit so the disturbance from a surge can be enough to trip the overload detector.

Your UPS is rated for 1200 Volt-Amps, so it can drive a maximum of 10 Amps at 120 Volts. Every piece of equipment should have a label with the maximum Amps or Watts on it. Add up the Amps used by the equipment plugged into the UPS/AVR sockets to make sure the total is less than 10 Amps. If the equipment label rates power requirement in Watts, divide that number by 120 Volts to get the amperage. One thing to read carefully is the label on the computer power supply. It is commonly rated in output watts, but that is not the number to use for this calculation. Since it is not 100% efficient, you need to look for the input Amps number.

If you are too close to the limit, move the printer or monitor to a surge-only outlet or consider replacing the monitor with a more energy-efficient unit. If your load total is less than 9.5 Amps, the UPS may have a defect in the power overload detection or internal voltage regulation circuits.

UPS come in two types, lower powered cheaper types are usually switch over power.These units senses a power outage and then switch over to the battery power to generate mains supply. The switch over occurs in milli-secs and does not affect the computer.True UPS types constantly run off battery power to generate mains supply so there is no switch over time lag. These units are higher powered and higher costs units.

Both type of UPS have the same components.Battery charger.BatteriesInverter that converts battery voltage to mains voltageElectronic controls

Either the power supplies have both failed, which is unlikely, or they are not connected to a hot outlet. Frequently servers are connected to uninterruptible power supplies (UPS) instead of being connected directly to a wall outlet. Make sure the UPS is on and functioning.

Dell provides lifetime phone support for their servers so you should give them a call if you need more help tracking down the problem. (800) 945-3355

This server should never restart as you describe
1: Turn off remove all 3 power supplies clean, replace
2: Clean the insides removes and reset each add-on card’
3: Remove each of the SCSCI drive from the front “DONOT MIX” up makes sure each drive returns to the same place as removed if not raid will be broken.
4: Check the UPS Power backup this sounds like you are running direct not on a UPS battery backup if so then replace the power strip with 20 amp. The wall outlet should also be 20 amp circuit barkers
5: After you have clean the server check to be sure all three power supplies are showing “GREEN” lights
The most common problem causing instant restart on this server is loose or poor connections it is possible you may have a” virus”?
From what little I know poor line power is causing your problem too many devices connected to the same wall out let may not Trip a barker yet will cause recycle of the server.
Memo:
If you must operate this server not on a UPS Battery backup then make sure one power supply is on a different circuit, meening on a separate barker in service panel .I hope this will help solve you problem.

Why would you want to do this?
The UPS has it own battery and inverter and can supply power to the computer/server and if the power interruption is too long and the battery power is unable to maintain power to the computer/server, it can initiate a shutdown procedure so the computer/server can shut down in an orderly fashion without losing data.
The size of the UPS with its batteries and the power requirements of the computer/server can be calculated to give a a capacity from as little as 30 mins to hours.
There is no need to run a separate charger, batteries and inverter to supply power to an UPS (it has all these buint-in) and it is an unnecessary additional complication.

Maybe I am reading this wrong but it sounds like you are connecting the equipment in the wrong sequence. The service is plugged into the back of the UPS unit and the UPS is plugged into a wall outlet. The UPS is a power conditioner/surge protector that keeps your server from being fried if a sudden power surge goes through and it act as a back-up power source if you lose power. Try this new connection sequence and see if you have better luck.